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UPSTREAM: mc_tcu3: Swap LVDS even and odd lanes for a certain hardware

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Due to some LVDS cable constraints even and odd lanes needs
to be swapped on certain hardware. The hardware ID will be used to
distinguish between these two cases. The swapping itself will be done by
PTN3460, which is configurable for that.

BUG=None
BRANCH=None
TEST=None

Signed-off-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-on: https://review.coreboot.org/17576
Tested-by: build bot (Jenkins)
Reviewed-by: Mario Scheithauer <mario.scheithauer@siemens.com>

Change-Id: I339b2321a8ed1bc3bbf10aa8e50eb598b14b15fa
Reviewed-on: https://chromium-review.googlesource.com/415077
Commit-Ready: Furquan Shaikh <furquan@chromium.org>
Tested-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
This commit is contained in:
Werner Zeh 2016-11-23 07:49:52 +01:00 • committed by chrome-bot
commit 842be99dac
1 changed files with 11 additions and 1 deletions
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12
src/mainboard/siemens/mc_tcu3/ptn3460.c
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@ -15,6 +15,7 @@
#include <console/console.h>
#include <hwilib.h>
#include <string.h>
#include "soc/i2c.h"
#include "ptn3460.h"
@ -29,6 +30,7 @@ int ptn3460_init(char *hwi_block)
int status;
uint8_t disp_con = 0, color_depth = 0;
uint8_t edid_data[0x80];
uint8_t hwid[4], tcu31_hwid[4] = {7, 9, 2, 0};
if (!hwi_block || hwilib_find_blocks(hwi_block) != CB_SUCCESS) {
printk(BIOS_ERR, "LCD: Info block \"%s\" not found!\n",
@ -56,6 +58,11 @@ int ptn3460_init(char *hwi_block)
hwi_block);
return 1;
}
if (hwilib_get_field(HWID, hwid, sizeof(hwid)) != sizeof(hwid)) {
printk(BIOS_ERR, "LCD: Missing HW-ID from %s\n",
hwi_block);
return 1;
}
/* Here, all the desired information for setting up DP2LVDS converter*/
/* are present. Inside the converter, table 6 will be used for */
/* the timings. */
@ -78,7 +85,10 @@ int ptn3460_init(char *hwi_block)
cfg.lvds_interface_ctrl1 |= 0x20; /* Use 18 bits per pixel */
cfg.lvds_interface_ctrl2 = 0x03; /* no clock spreading, 300 mV LVDS swing */
cfg.lvds_interface_ctrl3 = 0x00; /* no LVDS signal swap */
if (memcmp(hwid, tcu31_hwid, sizeof(hwid)))
cfg.lvds_interface_ctrl3 = 0x00; /* no LVDS signal swap */
else
cfg.lvds_interface_ctrl3 = 0x01; /* swap LVDS even and odd */
cfg.t2_delay = 1; /* Delay T2 (VDD to LVDS active) by 16 ms */
cfg.t3_timing = 10; /* 500 ms from LVDS to backlight active */
cfg.t12_timing = 20; /* 1 second re-power delay */